SU819435A1 - Eccentric self-braking clutch - Google Patents

Description

one

The invention relates to the field of mechanical engineering and can be used in mechanisms where it is necessary to transmit torque only from the side of action of the driving forces.

An eccentric self-braking coupling is known, comprising a housing housed therein rigidly connected with the driving and driven eccentric shafts and a friction element made in the form of two identical rollers mounted with a certain eccentricity in the fixed housing between the eccentrics of the driving and driven shafts 1 .

Due to the small magnitude of the wedging angle, such a clutch is susceptible to wear and deformation: m in the contact parts, which reduces its reliability. In addition, its efficiency is low.

The purpose of the invention is to reduce the loss of transmitted power and increase the reliability of the coupling.

The goal is achieved by the fact that an eccentric self-braking coupling, comprising a housing, housed therein, rigidly connected with the drive and driven eccentric shafts, and a friction element interposed between them, according to the invention, is provided with a sleeve with a diametrically located hub, housed in the housing. In the form of a cradle mounted in the diametrically groove of the sleeve, spring-loaded to the body, the side surfaces of the cracker are made with profiled recesses, each of which is made prismatic. a recess for the eccentrics of the drive and the drive shaft, while the shaft eccentrics are made in the form of end protrusions with rolling bearings.

Figure 1 shows an eccentric sayutormozha schA coupling, a longitudinal section; FIG. 2 shows a section. A-A in FIG. If in FIG. 3 — section B — B in FIG. 1; n & Fig. 4 is a diagram showing the self-braking mode in this clutch. In Fig. 5 a diagram of the forces acting on the friction element in the torque transmission mode.

Eccentric samotoryuz schA

the coupling has a stationary body 1, in the covers 2 of which, on the rolling bearings 3, a sleeve 4 is installed. In the diametral slot 5 of the sleeve, a friction element is movably arranged,

Claims (2)

the form of the cracker 6 with the profile depressions 7 and 8 on the side surfaces. In the recess 7, a prismatic recess 9 (Fig. 2) is made, and in a recess 8 - a prismatic recess 10 (Fig. 3) with an angle at the apex of the prism 120-130 °, the working end 11. (Fig. 2) is harvested from the side the free end 12 with a spring 13 (Fig. 1) installed in the sleeve 4 to the fixed case 1. In this case, the prismatic recess 10 is located in the recess 8 on the free end side, and the recess 9 is on the working end side. The drive shaft 14 is mounted in sleeve 4 on rolling bearings 15 so that its eccentric, made in the form of a cylindrical end protrusion 16 with rolling bearings 17, is placed in a prismatic recess 10 of the profile recess 8. An eccentric, made in the form of a cylindrical end protrusion 18 of the driven shaft 19 with a rolling support 20 on it, placed in a prismatic recess 9 of the profile recess 7. Seals 21 are installed in the covers 2, and | i between the shafts 14 and 19 and the covers there are gaps. Rolling bearings 22 mounted on the driven shaft are necessary to prevent the sleeve from turning relative to the housing, i.e. ensuring reliable locking of the shaft 19 in self-locking mode, rolling bearings 17 mounted on the protrusion 16 of the drive shaft, contribute to increasing the efficiency of the coupling in the torque transmission mode of the moment. Rolling bodies (not shown in the figures) can be installed between the cracker b and the bushing 4 in the diametral groove 5, which allows to increase the efficiency of the coupling to a value close to 1. In the self-braking mode (the drive shaft 14 is not loaded) the coupling works as follows. . Under the action of the torque M2 (figure 4) on the driven shaft 19, the eccentric roller bearing (bearing) 20, acting on the behavior of the prismatic recess 9, presses the working end 11 of the cracker 6 against the non-movable body 1 with the force e-cos where in - the eccentricity of the protrusion on the driven shaft; about - the angle of the prismatic grooves and 10 (figure 4). (2) 60 OS 2 K-arc-cos where K is the reliability factor of the motor ormo; the coefficient of friction between the case and the cracker R is the radius of the inner surface of the case (for example, for parameters K 11.2, fo 0.08, R 2.5 cm, e 0.4 cm, o6 from relation (2) is 120-130 The friction force F 2 of the current acting on radius R provides for self-braking of the driven shaft. In the torque transfer mode (traction mode), the clutch works as follows. When the drive shaft 14 is loaded with the torque M (fig.4) the end protrusion 16 through the rolling support (bearing) 17 acts on the surface of the prismatic recess 10, pressing the cracker b in the groove 5 of the sleeve 4, thereby unloading the working end 11 from the braking forces from the stationary body 1. At the same time, the shafts 14 and 19, the cracker, the sleeve are closed in a single shaft, i.e. the torque transmitted by the shaft 14 to the cracker , through the surface of the prismatic recess 9 and rolling support 20, the end protrusion 18 is transmitted to the shaft 19. During operation, the shafts 14 and 19 rotate together with the sleeve and the cracker in the bearings 3 installed in the covers 2. Indeed, when the drive shaft is loaded with a torque M (figure 5 on the corresponding surface of the prismatic recess 10 cracker b, a balanced force N 2 symmetrical to the braking force N 2 occurs; (and when the effective force N is sufficient to balance the braking force N2 and the coating loss in the coupling, movement is provided. This eccentric self-braking coupling allows to reduce the loss of transmitted power and is more reliable in operation compared to the known couplings of this type. It can be used It is used, for example, in the pickup mechanisms of radar antennas, gearless power amplifiers, in feed drives of machine tools, rudder deflection systems of aircraft and ships, lifting brakes and vehicle brakes, etc. In addition, it improves the efficiency of many gears containing as a self-braking link a wormhole pair with a rather low efficiency. Claims of the invention An eccentric self-braking coupling, comprising a fixed housing, housed in it, rigidly connected with the leader and th eccentric shafts and disposed therebetween friction element, characterized in that, to reduce the